a. 1. List Shewhart’s two types of variation. What are they

a. 1. List Shewhart’s two types of variation. What are they

a. 1. List Shewhart’s two types of variation. What are they also called?
2. Define “in statistical control.”
3. Explain briefly what an  -chart and an R -chart do.
4. What might cause a process to be out of control?
5. List five steps in developing and using -charts and R -charts.
b. 1. List some possible causes of assignable variation.
2. Explain how a person using 2-sigma control charts will more easily find samples “out of bounds” than 3-sigma control charts. What are some possible consequences of this fact?
3. When is the desired mean, μ, used in establishing the centerline of a control chart instead of ?
4. Can a production process be labeled as “out of control” because it is too good? Explain.
 

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